Private conversion
Convert Opus to MP3 without upload
Many online audio converters require you to upload a file before they process it. That can be uncomfortable when the file is a voice message, an interview, a work recording, or any private audio.
OpusMP3 is designed as a static browser tool. It reads the selected audio file locally, decodes it in your browser, encodes an MP3 copy, and gives you a download link without sending the audio to a backend server.
When this is the right choice
- You only need a quick MP3 copy of a small or medium Opus file.
- You do not want to upload private audio to a third-party service.
- You are using a modern desktop browser with local audio decoding support.
Limitations
Very large audio files may be slow because the work happens on your device. Some mobile browsers also limit local audio decoding. For best results, use Chrome, Edge, or Firefox on desktop.